JPH11240492A - Tilt lock device for outboard motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge the space for installing the first relief valve, to make the tilt lock device more compact than when providing the first relief valve outside the cylinder, and to eliminate the exterior communication passage for connecting the cylinder with the outside. SOLUTION: The tilt lock device includes a cylinder 12, a piston inserted in the cylinder 12 movable in vertical direction, a piston rod 14 attached to the upper portion of the piston, upper and lower oil chambers S1, S2 formed above and below the piston, an accumulator chamber S3 which communicates with the upper and lower oil chambers S1, S2 via upper and lower oil, passages 45, 12a and which is attached to the cylinder 12 so as to surround the cylinder 12, and a first relief valve 18 which is disposed in the upper oil passage 45 and which opens when the pressure inside the upper oil chamber S1 exceeds a predetermined value due to rising of a piston 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in a tilt lock device for an outboard motor.

[0002]

2. Description of the Related Art As a tilt lock device for an outboard motor, for example, Japanese Patent Publication No. 2-58155 entitled "Tilt Lock Device for an Outboard Motor" is known.

The above technique achieves a reduction in the tilt-up operation force in addition to the basic function of the tilt lock device by a simple structure, and is shown in FIGS. 1, 4 and 5 of the publication. The cylinder 8, the piston 12 movably inserted into the cylinder 8, and the piston 12
, A first chamber 8a and a second chamber 8b which are oil chambers partitioned on both sides of the piston 12, and a piston 12 inside the first and second chambers 8a and 8b communicating with each other. Passages 13 and 14 and these passages 1
Non-return valves 15 (first relief valves), 16 provided in the middle of 3, 14 and a communication passage 24 for connecting the first and second chambers 8a, 8b outside the cylinder 8 by bypassing the piston 12.
A switching valve 37 provided in the middle of the communication passage 24; a valve seat 42, a valve body 44, and a spring 47 provided in the switching valve 37.
And a second relief valve comprising: The first relief valve and the second relief valve are for reducing the impact received by the outboard motor B when the outboard motor B collides with an obstacle such as driftwood.

[0004]

In the above technique, the check valve 16 is attached to the piston 12, so that the first relief valve 15, which is also attached to the piston 12, is limited in size due to a small installation space. However, there is an inconvenience that the degree of freedom in design is reduced and it is difficult to obtain a sufficient cushioning performance of the tilt lock device.

The tilt lock device occupies a large space since the second relief valve having the same function as that of the first relief valve 15 is provided separately from the second relief valve.
Since the communication passage 24 extends from the cylinder 8 to the outside of the cylinder 8 and the switching valve 37 is provided in the middle of the communication passage 24,
There is a disadvantage that piping during assembly is troublesome.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tilt lock device for an outboard motor which can improve the shock absorbing performance, is compact, and can reduce the cost.

[0007]

According to a first aspect of the present invention, there is provided an outboard motor mounted on a stern, and when the outboard motor is swung from a use position to a standby position. The tilt lock device is provided between the stern and the outboard motor to reduce the impact applied to the outboard motor during traveling. And a piston inserted vertically into the cylinder, a piston rod mounted on the upper part of the piston, upper and lower oil chambers formed above and below the piston, and upper and lower oil passages in the upper and lower oil chambers. A pressure accumulating chamber attached to the cylinder so as to surround the cylinder, and a valve interposed in the upper oil passage, which opens when the piston rises and the pressure in the upper oil chamber exceeds a predetermined value. It was composed of a first relief valve.

Since the first relief valve is interposed in the upper oil passage above the cylinder, the space for mounting the first relief valve is increased, and the design of the first relief valve, such as the relief pressure, the mounting dimensions, and the number, is free. Since the degree is increased, the buffer performance of the tilt lock device can be improved.
Further, the tilt lock device becomes more compact than providing the first relief valve outside the cylinder. Further, an external communication path connecting the cylinder to the outside is not required.

According to a second aspect of the present invention, the pressure accumulation chamber is formed by surrounding the cylinder with an outer cylinder, and the center of the outer cylinder is a cylinder having a flat cross section. By mounting the tilt lock device so that the flat direction is the front-rear direction of the outboard motor, the space in the front-rear direction occupied by the tilt lock device is reduced.

According to a third aspect of the present invention, there is provided a communication passage for communicating the upper and lower oil chambers with the piston, and a second relief valve which opens when the pressure in the lower oil chamber exceeds a predetermined value is provided in the communication passage.
In a shallow running state in which the piston rises to the middle of the cylinder, when the pressure in the lower oil chamber exceeds a predetermined value, the second relief valve is opened, and the piston is automatically lowered to release the shallow running state. I made it possible.

During traveling in shallow water, for example, when the thrust of the outboard motor forward is increased to apply a compressive force to the tilt lock device, the pressure in the lower oil chamber exceeds a predetermined value and the second relief valve Is opened, the upper oil chamber and the lower oil chamber communicate with each other, and the state automatically shifts to a normal running state in which the piston is lowered most.

According to a fourth aspect of the present invention, the cylinder member is inserted into the accumulator with a predetermined gap from the cylinder, and the accumulator is filled with hydraulic oil and gas so that the lower end of the cylinder is always immersed in hydraulic oil. By configuring the oil passage with a gap, the gas in the accumulator is prevented from flowing back to the upper oil chamber via the upper oil passage when the first relief valve is opened. When the first relief valve is opened, gas in the accumulator does not flow back into the upper oil chamber, so that gas does not accumulate in the upper oil chamber.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a side view showing a state in which a tilt lock device according to the present invention is mounted between a stern and an outboard motor,
A stern bracket 2 is fixed to the stern 1, a swivel bracket 4 is attached to the stern bracket 2 so as to be rotatable up and down around a horizontal axis 3, and an outboard motor 5 is attached to the swivel bracket 4. 3 shows a state where the tilt lock device 10 is interposed between the swivel bracket 4 and the swivel bracket 4. 6 is a propeller of the outboard motor 5,
Reference numerals 7 ... (... indicate a plurality; the same applies hereinafter) are position adjustment holes formed in the rear part of the stern bracket 2. Reference numeral 8 denotes a stopper pin for adjusting the tilt-down position of the outboard motor 10 by selecting and inserting the position adjustment holes 7.

FIG. 2 is a side view of the tilt lock device according to the present invention, and shows that the width of the trunk 10a of the tilt lock device 10 is constant from the upper part to the lower part in the longitudinal direction of the hull except for the constricted part 10b. .

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2, and shows a state where the tilt lock device 10 is most contracted. The tilt lock device 10 includes an outer cylinder 11 having a central longitudinal portion expanded outward, an inner cylinder 12 serving as a cylinder disposed inside the outer cylinder 11, and a piston 13 inserted into the inner cylinder 12 so as to be vertically movable. And this piston 13
A hollow piston rod 14 as a piston rod extending to the upper part of the piston, and a manual opening / closing valve 1 serving also as an attachment member for attaching the hollow piston rod 14 to the piston 13
5 and a manual operation mechanism 16 for opening and closing the manual opening / closing valve 15
And an upper block 17 mounted on the upper part of the inner cylinder 12 and first relief valves 18 provided in the upper block 17.

The tilt lock device 10 has a rod guide 21 mounted on the upper portion of the outer cylinder 11 for guiding the hollow piston rod 14 moving up and down, and a predetermined gap provided outside the inner cylinder 12. And an intermediate cylinder 2 as a tubular member having its upper portion sandwiched and fixed between the rod guide 21 and the outer cylinder 11.
2 and a second relief valve 23 provided in the piston 13
And a lower block 24 attached to the lower part of the outer / inner cylinders 11, 12. Reference numeral 26 denotes an upper mounting member for rotatably mounting the upper portion of the manual operation mechanism 16 to the swivel bracket 4 (see FIG. 1).

Further, the tilt lock device 10 also functions as an upper oil chamber S1 and a lower oil chamber S2 in which the inner cylinder 12 is partitioned by a piston 13, and a volume compensation chamber provided between the outer cylinder 11 and the inner cylinder 12. And an accumulator S3 as a pressure accumulating chamber.

The outer cylinder 11 has an upper cylindrical portion 11a,
The widened portions 11b, 11b swelled outward, the lower cylindrical portion 11c, and the upper cylindrical portion 11a, the widened portions 11b,
It comprises upper inclined portions 11d, 11d formed between 11b, and lower inclined portions 11e, 11e formed between the widened portions 11b, 11b and the lower cylindrical portion 11c.

The manual operation mechanism 16 includes a base 16a mounted on the upper end of the hollow piston rod 14, a cam shaft 16b rotatably mounted on the base 16a, a cam 16c formed on the cam shaft 16b, Part 1
The operation rod 16d moves up and down in the hollow piston rod 14 following the peripheral surface of the hollow piston 6c. In addition, 16e is a hexagonal end for attaching a handle (not shown).

The lower block 24 includes the tilt lock device 1
0 also serves as a mounting member for rotatably mounting the lower end to the stern bracket 2 (see FIG. 1). Accumulator S3
The upper part is filled with a gas higher than the atmospheric pressure, the lower part is filled with hydraulic oil, and the lower oil chamber is opened at lower oil passage holes 12a, 12a (see FIG. 5) opened at the lower end of the inner cylinder 12. It communicates with S2. In addition, FS is an oil level.

When the hollow piston rod 14 enters the inner cylinder 12 by the accumulator S3, the operating oil corresponding to the entering volume of the hollow piston rod 14 is supplied from the upper and lower oil chambers S1 and S2 to the oil passage holes 12a and 12a. 12a (FIG. 5
To the accumulator S3 through the oil level F
When S rises and the hollow piston rod 14 withdraws from the inside of the inner cylinder 12, hydraulic oil corresponding to the withdrawal volume of the hollow piston rod 14 flows from the accumulator S3 into the oil passage hole 1.
Upper and lower oil chambers S1, 2a and 12a (see FIG. 5)
After moving into S2, the oil level FS falls, and the upper and lower oil chambers S
Compensate for the change in the volume of the hydraulic oil in S1 and S2.

FIG. 4 is a sectional view taken along the line 4-4 in FIG. 2, and a section passing through the widened portions 11b, 11b at the center of the outer cylinder 11 is formed into a flat cylinder. C1, straight line L1, semicircle C2 with radius R, and straight line portion L2
Indicates that an accumulator S3 is provided between the outer cylinder 11 and the inner cylinder 12.

As described above, the tilt lock device 10 (FIG. 3)
) Is formed by surrounding the inner cylinder 12 with the outer cylinder 11 to form an accumulator S3. The center of the outer cylinder 11 is a flat-section tube, so that the outboard motor 5 ( By mounting the tilt lock device 10 (see FIG. 3) so as to be in the front-rear direction of FIG.
The space in the front-rear direction occupied by the tilt lock device 10 (see FIG. 3) is reduced, so that the operability of the outboard motor 5 (see FIG. 1) during steering and tilt operation can be improved, and the two brackets 2 can be used. , 4 (see FIG. 1).

FIG. 5 is an enlarged sectional view of the lower portion of the tilt lock device according to the present invention. The outer cylinder 11 is welded to the lower block 24. The inner cylinder 12 has its lower end inserted into the small diameter portion 24a of the lower block 24 with a slight interference fit or a slight clearance fit. The piston 13 includes a plate 13 a that presses the upper end of the second relief valve 23 between the piston 13 and the hollow piston rod 14.

The lower part of the hollow piston rod 14 is a small-diameter vertical hole 14a for guiding the operation rod 16d of the manual operation mechanism 16 (see FIG. 3) up and down, and an intermediate vertical hole formed below the small-diameter vertical hole 14a. 14b, a large-diameter vertical hole 14c formed below the intermediate vertical hole 14b, a screw 14d formed above the large-diameter vertical hole 14c, and a large-diameter vertical hole 14c penetrating from the large-diameter vertical hole 14c to the upper oil chamber S1. First oil passages 14e, 14e. The piston 13 and the hollow piston rod 14
A communication passage 28 is provided for communicating the upper oil chamber S1 and the lower oil chamber S2. The communication passage 28 is provided with a manual opening / closing valve 15 on the way.

The manual on-off valve 15 is provided with the hollow piston rod 1
4, a valve case 15a also serving as a valve seat, and a valve element 15b provided in the valve case 15a.
a spring 15d for pressing b at the upper end via a retainer 15c, and a lower lid 15e for supporting the lower end of the spring 15d and closing the lower part of the valve case 15a.

The valve case 15a communicates with the first horizontal oil passages 15f, 15f opened on the upper side surface of the valve body 15b, and the first horizontal oil passages 15f, 15f and the first oil passages 14e, 14e of the hollow piston rod 14. Annular oil passage 15g and valve body 15
b, a valve chamber 15k for accommodating the valve element 15b, the retainer 15c, and the spring 15d, and the valve chamber 15k and the lower oil chamber S2.
And a second horizontal oil passage 15m that communicates with Note that 15
n is a male screw formed on the upper part of the valve case 15a, which is screwed into the female screw 14d of the hollow piston rod 14.

The operation rod 16d of the manual operation mechanism 16 (see FIG. 3) includes a large diameter portion 16g, an intermediate diameter portion 16h, and a lower small diameter portion 16j. The lower small diameter portion 16j has an outer diameter smaller than an inner diameter of the vertical oil passage 15h of the manual on-off valve 15,
The lower end pushes down the valve element 15b of the manual on-off valve 15, and an oil passage 31 is formed between the inner periphery of the vertical oil passage 15h and the outer periphery of the lower small diameter portion 16j. 32, 33
Is a spring and a retainer, which is interposed between the lower end of the large-diameter portion 16g and the upper end of the valve case 15a of the manual opening / closing valve 15, so that the upper end of the operation rod 16d is connected to the cam shaft 16b shown in FIG. This is pressed against the cam portion 16c.

In FIG. 5, the second relief valve 23 has a piston 13 serving as a valve case and a valve seat, and a valve body 23a,
A spring 23c for pressing the valve body 23a downward on the closed side via a retainer 23b;
Valve chamber 2 for housing retainer 23b and spring 23c
3d, and an oil passage (not shown) communicating from the valve chamber 23d to the upper oil chamber S1 and an oil passage 23e communicating to the lower oil chamber S2. Reference numeral 34 denotes a ring for positioning the upper end of the spring 23c, and reference numerals 35 and 36 denote O-rings. Communication passage 2
8 is the first oil passage 14 of the hollow piston rod 14 described above.
e, 14e, the inner circumference of the hollow piston rod 14, and the inner circumference of the piston 13.

FIG. 6 is an enlarged cross-sectional view of the upper portion of the tilt lock device according to the present invention.
a, an upper small diameter portion 17b provided on the upper portion, and the inner cylinder 1
2 is inserted through the O-ring 37 in the lower small diameter portion 17c.
And a recess 17 serving as a valve chamber of the first relief valves 18, 18.
d, 17d, and the upper oil chamber S from the recesses 17d, 17d.
1 and oil passages 17f and 17f communicating with an oil chamber S4 outside the upper small-diameter portion 17b. Reference numerals 17g and 17g denote bottoms of the recesses 17d and 17d serving as valve seats of the first relief valve 18, and 38 denotes an O-ring for sealing a gap between the hollow piston rod 14 and the upper block 17.

The first relief valve 18 is a relief valve that opens when the pressure in the upper oil chamber S1 exceeds a predetermined value.
a, 18a and a spring 18 for pressing these valve bodies 18a, 18a downward via retainers 18b, 18b.
c, 18c.

The rod guide 21 is provided with a concave portion 21a provided in the upper part of the inner periphery for mounting the dust seal 41, and a constricted portion 21b. It was bent and attached. In addition, 42, 43, and 44 are O-rings.

The intermediate cylinder 22 is provided with a gap D1 having a gap dimension CL1 with the inner cylinder 12, and a gap D2 having a gap dimension CL2 with the rod guide 21.
The upper end is inserted between the outer cylinder 11 and the rod guide 21, and the outer cylinder 1 is inserted into the narrow portion 21 b of the rod guide 21.
When caulking 1, fix it together by caulking, and attach the lower end E to the oil level F
Even if S goes up and down, it is always immersed in hydraulic oil. The upper passage 17 includes an oil passage 17e, a recess 17d, an oil passage 17f, an oil chamber S4, a gap D2, and a gap D1.
Is configured.

As described above, the tilt lock device 10 (FIG. 3)
), An inner cylinder 12, a piston 13 (see FIG. 5) movably inserted into the inner cylinder 12, and a piston rod 14 mounted on an upper portion of the piston 13.
And upper and lower oil chambers S formed above and below the piston 13
1, S2 (see FIG. 5) and these upper and lower oil chambers S1,
S2 communicates with the upper and lower oil passages 45, 12a (see FIG. 5), and is connected to an accumulator S3 attached to the inner cylinder 12 so as to surround the inner cylinder 12, and a relief valve interposed in the upper oil passage 45. The first relief valve 18, which opens when the pressure of the piston 13 rises and the pressure in the upper oil chamber S1 exceeds a predetermined value, makes the first
The space for mounting the relief valves 18, 18 is increased, and the degree of freedom in designing the relief pressure, the mounting dimensions, the number, etc. of the first relief valves 18, 18 is increased, so that the cushioning performance of the tilt lock device 10 can be improved. it can.

Further, the tilt lock device 10 can be arranged in a manner different from the case where the first relief valves 18 are provided outside the inner cylinder 12.
3 (see FIG. 3), the degree of freedom in mounting between the stern and the outboard motor 5 shown in FIG. 1 for mounting the tilt lock device 10 is increased, and the tilt lock device 1 is mounted.
The degree of freedom in designing the shapes of the stern bracket 2, the swivel bracket 4, and the outboard motor 5 attached to both ends of the outboard motor 5 can be increased. Further, handling during transportation and storage before attaching the tilt lock device 10 to the hull is facilitated.

Further, there is no need for an external communication passage connecting the inner cylinder 12 (see FIG. 3) to the outside, and there is no need to perform piping or cast molding the communication passage integrally with the cylinder side.
Assembling of the tilt lock device 10 (see FIG. 3) is facilitated, and cost can be reduced. As described above, the cost of the outboard motor 5 including the tilt lock device 10 and the mounting brackets 2 and 4 can be reduced.

The operation of the above-described manual operation of the tilt lock device 10 will now be described. FIGS. 7A and 7B are views for explaining the manual operation of the tilt lock device according to the present invention. FIG. 7A shows a state in which the manual on-off valve is opened, and FIG. 7B shows a tilt state of the outboard motor. Show. For example, when traveling in a shallow water, as shown in FIG. 7B, it is necessary to tilt the outboard motor 5 upward such that the lower end of the outboard motor 5 does not interfere with the seabed or the riverbed. In such a case, first, in FIG. 3, the camshaft 16b of the manual operation mechanism 16 is rotated by hanging a dedicated handle on the hexagonal end 16e. Thereby, the operation rod 16d is lowered by the cam portion 16c of the camshaft 16b.

In FIG. 7A, by lowering the operation rod 16d, the valve body 15b of the manual on-off valve 15 is pushed down at the lower end of the operation rod 16d. This allows
The manual on-off valve 15 is opened, and the upper oil chamber S1 is connected to the first oil passages 14e, 14e of the hollow piston rod 14, the manual on-off valve 15
Oil passage 15g, first horizontal oil passages 15f, 15f, oil passage 3
1, communicates with the lower oil chamber S2 via the valve chamber 15k and the second horizontal oil passage 15m, the hollow piston rod 14 and the piston 1
3 can be moved up and down.

In FIG. 7B, the outboard motor 5 is manually tilted upward at a desired angle in the state of FIG. 7A. At this time, since the pulling force acts on the tilt lock device 10, the piston 13 shown in FIG. 7A starts to rise, the pressure in the upper oil chamber S1 increases, and the upper oil chamber S1 increases.
The hydraulic oil in the inside is the first oil of the hollow piston rod 14 described above.
Oil passages 14e, 14e, annular oil passage 15 of manual on-off valve 15
g, first horizontal oil passages 15f, 15f, oil passage 31, valve chamber 15k
And flows into the lower oil chamber S2 through the second horizontal oil passage 15m. At this time, the pressure of the gas in the accumulator S3 assists the expansion of the tilt lock device 10 (see FIG. 7B), so that the above-described upward tilt operation can be easily performed.

Thereafter, the manual operation mechanism 1 shown in FIG.
When the camshaft 16b of No. 6 is rotated, the operating rod 16d is raised by the elastic force of the spring 32 shown in FIG. As a result, the operation rod 16
The lower end of d is separated, the valve body 15b is seated on the valve seat 15j by the elastic force of the spring 15d, the manual on-off valve 15 is closed,
The state is again as shown in FIG.

Accordingly, the hydraulic oil cannot flow between the upper and lower oil chambers S1 and S2, and the piston 13 cannot move up and down. This allows for shallow running. Also, when the hull is landed, the outboard motor 5 can be tilted to near horizontal by the manual operation of the tilt lock device 10 shown in FIG.

In order to return the outboard motor 5 to a substantially vertical state as shown in FIG. 1, the manual opening / closing valve 15 may be opened by the manual operation as described above. Thus, if the hull is stopped, the outboard motor 5 slowly returns to a substantially vertical state by its own weight. If the hull is traveling in shallow water, the outboard motor 5 returns to a substantially vertical state due to its own weight and thrust. At this time, the hydraulic oil in the inner cylinder 12 flows through a path opposite to that when the outboard motor 5 is tilted upward.

Next, the operation of the automatic operation of the tilt lock device 10 described above will be described. FIG. 8 is a diagram (first half) illustrating automatic operation of the tilt lock device according to the present invention, and shows a state in which an external force acts on the outboard motor. FIG. 9 is a diagram (second half) for explaining the automatic operation of the tilt lock device according to the present invention, and shows a state where the first relief valve is opened.

In FIG. 8, for example, the outboard motor 5
When the driftwood W collides with the front part of the outboard motor 5, a rearward force acts on the lower part of the outboard motor 5 as indicated by an arrow, and a tensile force acts on the tilt lock device 10. 3, the piston 13 (see FIG. 5) tends to rise due to the pulling force applied to the tilt lock device 10, and the pressure in the upper oil chamber S1 increases.

In FIG. 6, the pressure in the upper oil chamber S1 is a predetermined value, that is, the predetermined value = (the pressure in the accumulator S3) +
When (the set load of the spring 18c of the first relief valve 18) ÷ (cross-sectional area of the contact portion between the valve element 18a and the bottom portion 17g), as shown in FIG. open.

Then, in FIG. 9, the first relief valve 1
When the valve 8 is opened, the piston 13 (see FIG. 5) and the hollow piston rod 14 start to rise, and the hydraulic oil in the upper oil chamber S1 flows through the upper oil passage 45 into the accumulator S3 as shown by an arrow, Tilt lock device 10 shown in FIG.
Is extended, and the outboard motor 5 tilts. Therefore, the tilt lock device 10 can reduce the shock acting on the outboard motor 5 and prevent the outboard motor 5 from being damaged.

As shown in FIG. 6, the intermediate cylinder 22 is inserted into the accumulator S3 while keeping a predetermined gap D1 from the inner cylinder 12, and the lower end E of the intermediate cylinder 22 is constantly inserted into the accumulator S3. Filled with hydraulic oil and gas so as to be immersed in the gap D shown in FIG.
The first relief valve 18 includes the oil passages 17e and 17e of the upper block 17, the recesses 17d and 17d, the oil passages 17f and 17f, the oil chamber S4, the gap D2, and the gap D1. , 18 are opened, the gas in the accumulator S3 is prevented from flowing back to the upper oil chamber S1 via the upper oil passage 45, so that the gas does not accumulate in the upper oil chamber S1 and the tilt shown in FIG. The tilt lock performance of the lock device 10 can be maintained.

When the external force stops acting on the outboard motor 5, FIG.
The piston 13 shown in FIG.
The pressure inside decreases below a predetermined value, and as shown in FIG.
The first relief valve 18 closes. In FIG. 8, the outboard motor 5
When the vehicle runs normally after the vehicle is tilted, the outboard motor 5 may be returned to the vertical state as shown in the figure by manual operation.

As described above, since the first relief valve 18 is interposed in the upper oil passage 45 above the inner cylinder 12, the air mixed into the upper oil chamber S1 immediately after the assembly is removed from the piston 13
(See FIG. 5), the first relief valve 18 can be opened and released to the accumulator S3 by forcibly raising the inner cylinder 12 so that the inner cylinder 12 is surrounded by the inner cylinder 12.
The accumulator S3 is attached to the upper oil passage 45
Can be shortened. Therefore, air can be easily removed from these.

The operation of the above-described second relief valve 23 will now be described. FIG. 10 is a sectional view showing the operation of the second relief valve according to the present invention. For example, after the outboard motor 5 is tilted and travels in shallow water near the shore as shown in FIG. 7 (b), it goes offshore as shown in FIG. There is a case where the vehicle moves to the normal running.

At this time, the output of the outboard motor 5 is increased to increase the thrust. Thus, in FIG. 7B, a forward force acts on the lower portion of the outboard motor 5 by the increased thrust of the outboard motor 5. As a result, a compressive force acts on the tilt lock device 10.

In FIG. 10, the tilt lock device 1 is used.
0 (see FIG. 7B), the lower oil chamber S2
The second relief valve 23 opens when the pressure in the internal oil increases and the pressure difference between the pressure and the upper oil chamber S1 exceeds a predetermined value, and the hydraulic oil in the lower oil chamber S2 is supplied to the oil passage of the second relief valve 23. 23e,
Since the piston 13 descends because the oil flows into the upper oil chamber S1 via the valve chamber 23d and an oil passage (not shown), the tilt lock device 10 shown in FIG. 7B is contracted, and the outboard motor 5 is automatically turned off. It is in a substantially vertical state shown in FIG. When the pressure in the lower oil chamber S2 shown in FIG. 10 decreases below a predetermined value,
Since the second relief valve 23 closes and enters the tilt lock state, normal traveling becomes possible.

As described above, the piston is provided with the upper and lower oil chambers S.
1 and S2 are provided, and the communication path 28 is provided.
Is provided with a second relief valve 23 which is opened when the pressure in the lower oil chamber S2 exceeds a predetermined value, and the lower oil chamber S2 is moved in a shallow running state in which the piston 13 rises to the middle of the inner cylinder 12.
2 when the pressure in the second exceeds a predetermined value.
And the piston 13 can be automatically lowered to release the shallow running state, so that, for example, the forward direction of the outboard motor 5 shown in FIG. When a large compressive force is applied to the tilt lock device 10 by increasing the thrust, the piston 13 (see FIG. 10) descends, and the outboard motor 5 becomes almost vertical, and automatically returns to the normal running state. Can be migrated. Therefore, in this case, manual operation is eliminated, and the operability of the outboard motor 5 can be improved.

The tilt lock device 1 for an outboard motor according to the present invention.
0 is not limited to the outboard motor, and can be adopted for other lifting devices. In the embodiment, two identical first relief valves 18 (see FIG. 6) of the present invention are provided.
It is not limited to this, and each spring 18c
Either the spring constant or the number may be different (in the case of the number, one or three or more). Further, both the spring constant and the number may be different. When the above-mentioned spring constants are made different from each other, the impact to the outboard motor 5 (see FIG. 8) by the tilt lock device 10 can be absorbed stepwise, so that the cushioning effect can be further enhanced.

[0055]

According to the present invention, the following effects are exhibited by the above configuration. In the tilt lock device for an outboard motor according to the present invention, the tilt lock device is formed above and below the cylinder, a piston inserted into the cylinder so as to be vertically movable, a piston rod mounted on an upper part of the piston, and a piston. Upper part
A lower oil chamber, a pressure accumulator chamber connected to the upper and lower oil chambers via the upper and lower oil paths, and mounted on the cylinder so as to surround the cylinder, and a valve interposed in the upper oil path; And a first relief valve which opens when the pressure rises and the pressure in the upper oil chamber exceeds a predetermined value.
The space for mounting the relief valve is increased, and the degree of freedom in designing the relief pressure, the mounting dimensions, the number, and the like of the first relief valve is increased, so that the cushioning performance of the tilt lock device can be improved.

Further, the tilt lock device can be made more compact than providing the first relief valve outside the cylinder, and the degree of freedom in mounting the tilt lock device between the stern and the outboard motor is increased. The stern bracket and the swivel bracket attached to both ends of the tilt lock device and the outboard motor can be designed more freely. Further, handling during transportation and storage before attaching the tilt lock device to the hull is facilitated.

Furthermore, there is no need for an external communication passage connecting the cylinder to the outside, and there is no need to perform piping work or cast molding of the communication passage integrally with the cylinder side, so that the tilt lock device can be easily assembled and the cost can be reduced. Can be achieved. As described above, the cost of the outboard motor including the tilt lock device and the mounting bracket can be reduced.

The tilt lock device for an outboard motor according to claim 2 is
The pressure accumulation chamber is formed by surrounding the cylinder with an outer cylinder, and the center part of the outer cylinder is a tube with a flat cross section, so the tilt lock device is set so that the flat direction is the front and rear direction of the outboard motor. By mounting, the space in the front-rear direction occupied by the tilt lock device is reduced, and the amount of the outboard motor protruding rearward is reduced, improving the operability of the outboard motor during steering and tilt operation. Can be.

The tilt lock device for an outboard motor according to claim 3 is
The piston is provided with a communication passage connecting the upper and lower oil chambers, and the communication passage is provided with a second relief valve which opens when the pressure in the lower oil chamber exceeds a predetermined value. In the traveling state, when the pressure in the lower oil chamber exceeds a predetermined value, the second relief valve is opened, and the piston is automatically lowered to release the shallow running state. For example, when the output of the outboard motor is increased and a large compression force is applied to the tilt lock device, the piston descends and the outboard motor 5 becomes almost vertical, and automatically shifts to the normal running state. Therefore, manual operation is eliminated, and the operability of the outboard motor can be improved.

The tilt lock device for an outboard motor according to claim 4 is
A cylinder member is inserted into the accumulator with a predetermined gap from the cylinder, filled with hydraulic oil and gas so that the lower end of the cylinder member is always immersed in hydraulic oil in the accumulator, and the upper oil passage is formed with a gap. Then, when the first relief valve opens,
Since the gas in the accumulator is prevented from flowing back to the upper oil chamber via the upper oil passage, the gas does not accumulate in the upper oil chamber, and the tilt lock performance can be maintained.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a tilt lock device according to the present invention is mounted between a stern and an outboard motor.

FIG. 2 is a side view of the tilt lock device according to the present invention.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 in FIG. 2;

FIG. 5 is an enlarged sectional view of a lower portion of the tilt lock device according to the present invention.

FIG. 6 is an enlarged sectional view of the upper part of the tilt lock device according to the present invention.

FIG. 7 is a view for explaining a manual operation of the tilt lock device according to the present invention.

FIG. 8 is a diagram illustrating the automatic operation of the tilt lock device according to the present invention (first half).

FIG. 9 is a diagram illustrating the automatic operation of the tilt lock device according to the present invention (second half).

FIG. 10 is a sectional view showing the operation of the second relief valve according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stern, 5 ... Outboard motor, 10 ... Tilt lock device, 11
... Outer cylinder, 12 ... Cylinder (inner cylinder), 12a
... lower oil passage (oil passage hole), 13 ... piston, 14 ... piston rod (hollow piston rod), 18 ... first relief valve, 22 ... cylinder member (intermediate cylinder), 23 ... second relief valve, 28 ... series Passage, 45: upper oil passage, C1, C2: semicircle, D1, D2: gap, E: lower end, L1, L2: linear portion, S1: upper oil chamber, S2: lower oil chamber, S3: accumulator (accumulator) ).

Claims (4)

[Claims] 1. An outboard motor is mounted on the stern, and when the outboard motor is swung from a use position to a standby position, the outboard motor can be stopped at an arbitrary position. In the tilt lock device interposed between the stern and the outboard motor in order to reduce the impact, the tilt lock device includes a cylinder, a piston inserted into the cylinder so as to be vertically movable, and an upper portion of the piston. An attached piston rod, upper and lower oil chambers formed above and below the piston, and a pressure accumulator which is connected to the upper and lower oil chambers via upper and lower oil passages and is attached to the cylinder so as to surround the cylinder. A tilt lock device for an outboard motor, comprising: a first chamber; and a first intermediary valve provided in the upper oil passage, the first relief valve being opened when a piston rises and pressure in the upper oil chamber exceeds a predetermined value. Place. 2. The outboard boat according to claim 1, wherein the pressure accumulation chamber is formed by surrounding the cylinder with an outer cylinder, and a central portion of the outer cylinder is a cylinder having a flat cross section. Machine tilt lock device. 3. A piston is provided with a communication passage connecting the upper and lower oil chambers, and a second relief valve that opens when the pressure in the lower oil chamber exceeds a predetermined value is provided in the communication passage. When the pressure in the lower oil chamber exceeds a predetermined value in a shallow running state in which
2. The tilt lock device for an outboard motor according to claim 1, wherein the relief valve is opened, and the piston is automatically lowered to release the shallow running state. 4. A cylinder member is inserted into the accumulator with a predetermined gap from the cylinder, and the accumulator is filled with hydraulic oil and gas so that the lower end of the cylinder is always immersed in hydraulic oil. By configuring the oil passage with the gap,
2. The tilt lock device for an outboard motor according to claim 1, wherein when the first relief valve is opened, gas in the accumulator is prevented from flowing back to the upper oil chamber via the upper oil passage.